84555551 has 4 divisors (see below), whose sum is σ = 85331400. Its totient is φ = 83779704.

The previous prime is 84555547. The next prime is 84555553. The reversal of 84555551 is 15555548.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 84555551 - 2² = 84555547 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (84555553) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 387761 + ... + 387978.

It is an arithmetic number, because the mean of its divisors is an integer number (21332850).

Almost surely, 2^84555551 is an apocalyptic number.

84555551 is a deficient number, since it is larger than the sum of its proper divisors (775849).

84555551 is a wasteful number, since it uses less digits than its factorization.

84555551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 775848.

The product of its digits is 100000, while the sum is 38.

The square root of 84555551 is about 9195.4092350477. The cubic root of 84555551 is about 438.9152878161.

The spelling of 84555551 in words is "eighty-four million, five hundred fifty-five thousand, five hundred fifty-one".